CAUTION: Before you begin any of the procedures in this section, see the safety instructions located in
the Product Information Guide.
CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet
before opening the computer cover.
System Board Components
Power Supply DC Connector Pin Assignments
The 305-W power supply can operate from an AC power source of 115 VAC or 230 VAC at 50 - 60 Hz. The power supply provides the DC operating voltages and currents listed in the following table.
Output Voltage
Minimum Current (A)
Maximum Current (A)1
+5 VDC
0.3
22.0
+3.3 VDC
0.32
17.0
+12A VDC
0.0
18.03,4
+12B VDC
0.0
18.03,4
-12 VDC
0.0
1.0
+5 VFP
0.0
2.0
1Maximum continuous total DC output cannot exceed 305 W. Maximum continuous combined load on +5-VDC and +3.3-VDC outputs cannot exceed 150 W.
2In system applications where +3.3 VDC is not used, these values may be 0 A without affecting the regulation of the other outputs.
3Maximum +12A and +12B VDC output (up to 19.0 A) will not exceed 15 seconds in duration. Under this condition, tolerance on the +12A and +12B VDC output, may be +/- 10%.
4+12A VDC and +12B VDC maximum combined power may not exceed 264W.
DC Power Connector P1
NOTE: The +3.3 VDC output wires (orange) must be 16 AWG. All other output wires must be 18 AWG.
